John b



Patented Mar. l4, I899.

s L E E H w OK, .I

B I N E (Application filed Jan. 18, 1899.)

R U RT WF 0 ME .R U T 0 A F U N A M No. 62l,270.

(No Model.)

M mile-(Mat UNITED STATES JOHN B. MCCORMICK, JR., OF YORK, PENNSYLVANIA, ASSIGNOR TO THE YORK MANUFACTURING COMPANY, OF SAME PLACE.

MANUFACTURE OF TURBINE WHEELS.

SPECIFICATION forming part of Letters Patent No. 621,270, dated March 14, 1899.

Application filed January 16, 1899. serial No. 702,242. (No model.)

To all whom it may concern:

Be it known that I, JOHN B. MCCORMICK, J r., of York, in the county of York and State of Pennsylvania, have invented a certain new and useful Improvement in the Manufacture of Turbine Wheels, of which the following is a specification.

The object of my invention is to simplify and expedite the operation of casting turbine wheels, and particularly to provide means which will hold the buckets accurately and firmly in position while the sand is being rammed into the mold box or flask around the buckets and will at the same time permit the hub or central boss of the mold-forming apparatus to be readily Withdrawn after the sand has been filled in.

My invention will first be described in connection with the drawings accompanying and forming part of this specification and will then be more particularly pointed out in the claims.

In the drawings, Figure 1 is a perspective view of a device embodying my invention in its preferred form. Fig. 2 is a plan of the same.

The hub A, by which the central hub-cavity in the sand mold is produced, is of tapering contour, as shown, and rises from its flaring base to the height required for the hub of the turbine wheel.

Around the periphery of the wheel at or near its upper end is a series of hooks a at equal distances apart and equal in number to the buckets which the wheel is to have. Around the base of the hub and formed preferably in the annular circumscribing rim or rib m is a corresponding series of nicks or notches b.

The buckets B have each the shape shown in Fig; 1. What is essential in the bucket, so far as concerns my present invention, is that that portion a of its inner edge upon which the hub of the wheel is to be cast shall be so formed that when in position upon the hub A it will fit throughout its length snugly against the latter. When the bucket is fitted into place upon the hub A, the outer corner of its edge portion 0 enters its appropriate nick or notch 11, while at its upper part, or

what is its upper part when it is in the moldforming apparatus, this edge portion 0 is received in its appropriate hook at. In this position the edge portion 0 of the bucket is approximately tangential to the hub A,against which it fits closely, While it is held most firmly at the points a and b. In this way and by these means the buckets will be held immovably in their proper positions in the mold-box during the operation of ramming in the sand around and between them. The band of the wheel is intended to be cast around the outer edges (1 of the buckets, and these edges as well as the inner edges 0 are so thickened and formed that in the subsequent casting operation they will be dovetailed into the band and the hub of the wheel, respectively.

In order to form the sand mold, thehub A, armed with the buckets B, fitted and held thereon, as described, is placed upon the usual bottom board, the ordinary sand-mold fiask is placed around it, resting also on the bottom board, and then the sand is packed and rammed in around and between the buckets 'until the flask or mold-box is properly filled,

. and hubare withdrawn, leaving the sand-mold section having embedded in it the buckets in proper position to receive the band and hub which are to be cast upon them, the sand being cleared away from the edges 0 and d of the buckets sufficiently to provide for their firm union with the hub and band, respectively. The operation of casting the hub and band upon the buckets is conducted in the manner usually practiced, as described, for example, in my Letters Patent No. 554,292, of

- February 11, 1896, and requires, therefore, no

particular description here, being well known to those skilled in the art to which my present invention relates. The form and arrangement of the hub A and the hooks a and the nicksb are such as to permit them to be easily andquickly withdrawn from the buckets and the sand-mold section without disturbing the position and adjustment of the buckets and without breaking the sand mold. To facilitate this operation, I preferably swivel the hooks so that they will turn upon their stems or shanks as an axis. In this way when the sand-mold flask is filled up to or nearly up to the hooks aby which time the buckets will be firmly packed and held in their adjusted position by the sandthe hooks can be turned so as to be disengaged from the buckets and with their points or bent ends in vertical instead of horizontal position, as indicated for one of the hooks at a Fig. 1, thus facilitating their subsequent withdrawal with the hub from the sand-mold section.

The buckets shown in the drawings are what are known as left-hand buckets, which will revolve the wheel, say, from right to left. I can, however, by making the hooks ct reversible use them in connection with the same hub for right-hand buckets as well. For this purpose the hooks can be arranged so that they will turn upon their shanks as an axis, as hereinbefore provided and as indicated, for example, in Fig. 2, where one of the hooks is represented at a in its reversed position in connection with a right-hand bucket in dotted lines.

The notches or nicks Z) are so formed and of such dimensions that they will take either right or left hand buckets.

Having described my invention, what I claim herein as new, and desire to secure by Letters Patent, is-

1. In a mold-box for turbine wheels, a central tapering hub, having around its base a series of notches Z2, and having at or nearits upper end a corresponding series of peripherally-arranged hooks to, all arranged and adapted to be used in connection with the buckets O, substantially in the manner and for the purposes hereinbefore set forth.

2. In a mold-box for turbine wheels, a central tapering hub having around its base a series of notches b, and having at or near its upper end a corresponding series of peripherally-arranged reversible hooks a, all arranged and adapted to be used in connection with the buckets O, substantially in the manner and for the purposes hereinbefore set forth.

In testimony whereof I have hereunto set my hand this 6th day of January, 1899.

JOHN B. MCCORMICK, JR.

Vitnesses:

EWELL A.-DIoK, E. HUME TALBOT. 

